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Date: Mon, 30 Dec 2019 09:34:51 +0900 (JST)
Message-Id: <20191230.093451.1762483750956466101.t-ishii@sraoss.co.jp>
To: pgsql-docs@lists.postgresql.org
Subject: Question to datatype.sgml
From: Tatsuo Ishii <ishii@sraoss.co.jp>
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Hi,

Can you please someone elaborate what's the meaning of "even" in
datatype.sgml?

    <para>
     By default, floating point values are output in text form in their
     shortest precise decimal representation; the decimal value produced is
     closer to the true stored binary value than to any other value
     representable in the same binary precision. (However, the output value is
     currently never <emphasis>exactly</emphasis> midway between two
     representable values, in order to avoid a widespread bug where input
     routines do not properly respect the round-to-even rule.) This value will
                                          ~~~~~~~~~~~~~~~~~~~
     use at most 17 significant decimal digits for <type>float8</type>
     values, and at most 9 digits for <type>float4</type> values.
    </para>

I think "even" means "equality" here, not "even" of "even and odd".

Best regards,
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese:http://www.sraoss.co.jp